Shrub or small tree 2.5-10 m. high, rarely more; young branchlets usually densely short-pubescent, rarely subglabrous, and also ± grey-pruinose; pubescence grey, or yellowish at first then grey.

Leaves

Leaves: petiole (0.5)1-2 cm. long, eglandular; rhachis 2.5-9.5 cm. long, with a raised gland above at the junction of each pair of pinnae, but without other glands in between as in A. mearnsii; pinnae (5)12-26 pairs; leaflets in 17-50 pairs, 2.5-5.5 x 0.4-0.7 mm., linear-oblong.

Flowers

Flowers bright-yellow, in heads 4-7 mm. in diam. on peduncles up to 6 mm. long, panicled or racemose.

Fruits

Pods dehiscent along one margin, 3-8 x 0.7-1.3 cm., not or only slightly moniliform.